DoS via crafted TLS packet in Snort 3 Detection Engine (Cisco Secure Firewall FTD)
A vulnerability in the TLS cryptography functionality of the Snort 3 Detection Engine in Cisco Secure Firewall Threat Defense (FTD) Software allows an unauthenticated remote attacker to trigger an unexpected restart of the Snort 3 Detection Engine. The issue is attributed to an improper implementation of the TLS protocol; exploitation is performed by sending a crafted TLS packet to an affected system. TLS 1.3 is explicitly noted as not affected.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Recent activity
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.